0.9 Release Roadmap

[joshlf]

• In error types, treat "original source" type as a witness, use this to infallibly discard alignment errors when align_of::<Src>() >= align_of::<Dst>()
• In unsized MaybeUninit and Unalign, make sure T: Sized implies MaybeUninit<T>: Sized and Unalign<T>: Sized
• Model all memory operations in Ptr #859
• Include unsafe-fields API in zerocopy itself?
• Soundness hole in Ptr::read_unaligned #1892
• Complete renames for Add FromBytes/IntoBytes methods which read from/write to an io::Read/io::Write #158
• https://github.com/google/zerocopy/issues?q=label%3Aneeds-backport
• Rename KnownLayout::PointerMetadata to Metadata to be forwards-compatible with core::mem::Pointee?